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Protein and mRNA levels are more abundant at higher KR-ratio. Subsets of proteins are formed for KR-ratio < 0.5 and KR-ratio > 2.0, and the cumulative percentage of these subsets plotted as the expression level increased. Log (to base 2) of mRNA expression is used. (A) mRNA levels in E. coli.31 (B) Yeast mRNA.32 (C) mRNA abundance for protein-coding genes that are expressed across a series of tissues.34 (D) Protein levels in human blastoma cells.35
